We are looking into this too. Just curious, are you looking to prioritize the WiFi traffic? We are currently using ours only with the WiFi and plan to setup a separate SSID for them with a higher priority. I have not done any testing yet to see if it will actually help though.

Just FYI from recent mock-up work I've done on the subject:
Unless you use something (like Aruba's AirGroup feature) that proxies the Bonjour/mDNS requests, AppleTV's can potentially impact your wifi performance because those are very chatty protocols designed for small/few node subnets. Lots of them and/or large broadcast domains COULD get a little messy/ugly. A separate SSID that connected to a separate VLAN/subnet would address that (or an SSID that contains multiple VLANs/subnets), but without a proxy again, you can connect to them across subnets, so your iPads have to be on the same subnet as well then. Since we're an Alcatel/Aruba shop that AirGroup looks like it'll save me some headache and all specific access rules, QoS, etc. through our central controls.
Due to those concerns, I haven't even looked into the specific traffic patterns or prioritizing within other flows. Sorry.

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